摘要
田间试验研究了红芪氮素吸收分配动态和多糖含量的变化规律,以及增施3种水平坡缕石(P1,750 kg.hm-2;P2,1 500 kg.hm-2;P3,2 250 kg.hm-2)对红芪吸氮和多糖积累的影响。结果表明:6月下旬至7月下旬是红芪茎叶对氮的营养临界期,而红芪根在8月下旬以后对氮的需求量增大,9月下旬至10月下旬为氮素从茎叶向根系转移的时期,6月下旬至8月下旬是红芪多糖含量的快速积累期。在红芪收获期,NPK+P3、NPK+P2和NPK+P1处理的全株氮素积累量分别比NPK对照提高45.22%、29.45%和20.06%,NPK+P3处理的茎叶氮素积累量比NPK对照提高71.99%,NPK+P3、NPK+P2处理的根氮素积累量分别比NPK对照提高38.72%和26.07%;NPK+P1、NPK+P2和NPK+P3处理的多糖含量分别较NPK对照提高50.74%、62.95%和40.63%。坡缕石配施用量对红芪吸氮的促进效果综合表现为高用量>中用量>低用量,但其配施用量与多糖产量的关系还需进一步研究确定。
It is critical to establish a standard cultivation procedure for hedysari radix,and explore new ways of using less fertilizer for high yields of Chinese herbal crops,and provide theoretical basis for the application of palygorskite in cultivating Chinese tradi-tional medicine.To that end,a field experiment was conducted to study the dynamics,absorption and distribution of nitrogen and polysaccharides in hedysari radix.The effects of palygorskite application rates of 750 kg·hm 2（P1）,1 500 kg·hm 2（P2） and 2 250 kg·hm 2（P3） with NPK fertilizer on nitrogen absorption and polysaccharide accumulation in hedysari radix were also analyzed.The results showed that the critical period of nitrogen nutrition in aboveground part of hedysari radix was late June to late July.However,increased nitrogen requirement by the root system of hedysari radix was noted in late August.From late September to late October,nitrogen transfer occurred from aboveground part to belowground tissues.Also from late June to late August,the content of polysac-charides sharply increased in the root system of hedysari radix plant.Compared with only NPK application,combined application of palygorskite and NPK fertilizer increased N content at the late growth stage of the plant.It also increased N content in roots and ac-tive aboveground growth tissues.Compared with NPK treatment,NPK＋P3,NPK＋P2 and NPK＋P1 treatments increased hedysari radix N accumulation at harvest by 45.22%,29.45% and 20.06%,respectively.N accumulation in the aboveground part of the plant under NPK＋P3 treatment increased by 71.99%,compared with NPK treatment.N accumulation in the root system under NPK＋P3 and NPK＋P2 treatments increased by 38.72% and 26.07%,respectively.NPK＋P3 treatment promoted N accumulation and prolonged the period of N accumulation in the aboveground part of hedysari radix at the early growth stage.It also delayed N de-accumulation in the aboveground part of the plant at the late growth stage.NPK＋P3 and NPK＋P2 treatments enhanced the r
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2011年第4期750-754,共5页
Chinese Journal of Eco-Agriculture
基金
甘肃省农牧厅中药材专项项目(gyc09-06)资助
关键词
红芪
氮素
多糖
施肥
坡缕石
Hedysari radix
Nitrogen
Polysaccharide
Fertilizer application
Palygorskite
